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CVE-2026-94215

Keycloak-services: keycloak-services: cross-realm client read/write via request-level cache missing realm ownership check

5.5 Medium

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
High
Availability
Low

Exploit likelihood

0.36%Up 0.2 points since Sep 21, 2026
90%50%10%1%

What each source reports

CVE List Score used5.5

Keycloak-services: keycloak-services: cross-realm client read/write via request-level cache missing realm ownership check

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.

Record
CVE-2026-94215
CVSS 3.1
5.5 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
Weakness
CWE-862
Updated
2026-11-06
EUVDEUVD-2026-838415.5

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.

Record
EUVD-2026-83841
CVSS 3.1
5.5 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
Updated
2026-11-06
GitHub AdvisoriesGHSA-v5q7-f26g-qxgh5.5

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management...

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.

Record
GHSA-v5q7-f26g-qxgh
CVSS 3.1
5.5 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
Weakness
CWE-862
Updated
2026-11-06
NVD5.5

A flaw was found in the Admin REST API of Keycloak, an open-source identity and access management solution. The issue occurs because the API uses a per-request in-memory cache to resolve clients by their unique identifier without verifying if the client belongs to the realm specified in the request path. This allows an administrator with limited privileges to read or modify sensitive client configurations in the master realm by accessing them through a realm they control. Successful exploitation could lead to the exposure of client credentials or the redirection of administrative login attempts to malicious sites.

Record
CVE-2026-94215
CVSS 3.1
5.5 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:L
Weakness
CWE-862
Updated
2026-11-06

Affected products

History

History
RecordedChangedSources
products, referencesCVE List
facts, referencesEUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-94215 is a medium vulnerability (CVSS 5.5) in Red Hat Build Of Keycloak 26.6.8, published September 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 30th percentile. No source names a fixed version.

References

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